HUMBOLDT COUNTY, Calif. — Wednesday, November 4, 2026, late evening. A magnitude 5.0 earthquake struck off the Northern California coast near Petrolia at approximately 8:56 p.m. Pacific, according to the U.S. Geological Survey earthquake event page. The quake was shallow, with a preliminary reported depth of approximately 1.3 miles (2.1 kilometers). It occurred in an offshore seismic zone southwest of the Mendocino fault system.

What is confirmed so far

The San Francisco Chronicle reported at 9:10 p.m. on November 4 that there were no immediate reports of injuries. This means information was still limited at that hour; it is not a confirmation that no property was damaged. The magnitude was initially presented as 4.6 in some early reporting and subsequently revised to 5.0. Preliminary earthquake parameters may change again as scientists review instrument data.

Why the region is earthquake-prone

The North Coast lies near a complex meeting of major tectonic plates and the Mendocino Triple Junction, where earthquakes occur both offshore and on land. A quake’s magnitude measures energy released, not its exact effects in individual towns. Ground shaking varies depending on distance, depth, soil and building conditions. This report does not assume that every Humboldt community experienced the same shaking.

What residents should do

Anyone who felt the event can submit a USGS Did You Feel It? report. Check for damage to structures and utility connections, avoid visibly damaged buildings, and follow verified local emergency instructions. Coastal residents should never infer tsunami safety solely from an earthquake’s magnitude. For any active coastal alert, consult the National Tsunami Warning Center; for the latest quake details, use the USGS event record.

Reporting cutoff: 9:10 p.m. Pacific on November 4, 2026. Sources: USGS event ew1793854580 and San Francisco Chronicle late-evening report. The article will require a new verification before any later casualty, damage or alert claims can be made.

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